Uninstall multiple Software

Hello everyone,
I'm sorry for poor English.
I would like to start with Powershell. First I want to explore the possibilities to configure my local computer (Windows 10) with Powershell. I try, in my opinion a simple thing, to uninstall multiple software packages. But it seems it's still not so easy for me.

I wrote this and I got no error, but it doesn't work. Obviously I don't understand it yet. Can you tell me how it works please? Thank you.